The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Happy Numbers (Long) in all languages in chars. Achievements Cheevos Holes Languages Medals Miscellaneous All Holes 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Multitap Input Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> ALGOL 68 ArkScript Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig 05AB1E APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> ALGOL 68 ArkScript Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig Experimental Language 05AB1E APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Hole All 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Multitap Input Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Experimental Hole Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Chars Time Submitted 874th solisolu 715 83 20ms 8 days ago 882nd janbehrens 🇩🇪 715 115 472ms 23 Mar 2022 883rd emgordon154 714 100 13ms 27 Dec 2024 884th lynn 714 106 35ms 16 Nov 2021 885th tayloia 🇬🇧 713 83 16ms 11 May 2023 885th acollett89 713 83 11ms 4 Aug 2025 885th CaedenHarper 🇨🇦 713 83 15ms 15 Sep 2025 888th Yewzir 🇧🇪 713 113 3ms 13 Jan 2024 889th janbehrens 🇩🇪 713 165 25ms 20 Sep 2021 890th MeWhenI 🇻🇦 712 93 18ms 2 Oct 2022 891st Waffle3z 710 58 92ms 19 Sep 2021 891st emgordon154 710 58 38ms 12 Dec 2021 891st jbbarth 🇫🇷 710 58 40ms 5 Nov 2022 894th MeWhenI 🇻🇦 709 79 569ms 17 Jan 2024 894th namelessiw 709 79 575ms 14 Jul 2024 896th GolfingSuccess 🇬🇷 709 97 2ms 19 Mar 2025 896th dokutan 709 97 6ms 8 Nov 2025 898th Yewzir 🇧🇪 709 166 25ms 14 Jan 2024 899th akamayu-ouo 🇹🇼 708 35 5ms 30 Jul 2024 900th Bonjour27891 🇻🇳 706 84 66ms 9 Feb 2022 900th RDShah 706 84 331ms 11 May 2022 900th thehylian 706 84 20ms 2 Jan 2023 900th badboj40 706 84 306ms 12 Feb 2023 900th firegene 🇮🇪 706 84 21ms 22 Dec 2023 900th HumanoidCPU 706 84 24ms 23 Jun 2024 900th moustave 706 84 178ms 26 Nov 2024 900th SectorCorruptor 706 84 295ms 3 days ago 908th Garklein 🇨🇦 705 84 12ms 20 Feb 2022 909th primo-ppcg 🇹🇭 704 71 957ms 29 Nov 2021 910th HumanoidCPU 704 121 102ms 22 Jun 2024 911th Shanethegamer 🇺🇸 702 86 1,136ms 26 May 2025 912th MeWhenI 🇻🇦 701 53 151ms 19 Sep 2021 912th GrayJoKing 🇦🇺 701 53 79ms 20 Sep 2021 912th sean-niemann 🇺🇸 701 53 148ms 20 Sep 2021 912th scpchicken 🇵🇼 701 53 150ms 19 Dec 2022 912th Steffan153 🇫🇮 701 53 160ms 27 Jan 2023 912th DialFrost 🇸🇬 701 53 138ms 28 Jan 2023 912th snoozingnewt 🇨🇦 701 53 143ms 1 Sep 2024 912th fuzzylojik-golf 🇺🇸 701 53 99ms 15 Sep 2025 912th blaztoma 🇱🇹 701 53 146ms 23 Nov 2025 921st janbehrens 🇩🇪 701 98 2ms 21 Sep 2021 921st RYNO8 701 98 2ms 16 Aug 2022 923rd SirBogman 🇺🇸 700 80 585ms 15 Jan 2024 924th Shanethegamer 🇺🇸 700 168 24ms 20 Sep 2021 925th Lv0Sys 🇵🇱 699 67 409ms 5 Dec 2025 926th msbranicky 699 218 1,676ms 16 Sep 2025 927th OhmNomNom 698 59 36ms 20 Oct 2022 927th AlephSquirrel 698 59 68ms 14 Apr 2023 927th FlyingPenguin223 698 59 40ms 18 Oct 2023 927th SirBogman 🇺🇸 698 59 73ms 10 Jan 2024 927th error256 698 59 52ms 13 May 2024 932nd aposteriorist 🇨🇦 698 85 20ms 6 Feb 2022 932nd Ailko 🇧🇪 698 85 68ms 5 May 2022 932nd tkr-sh 🇰🇵 698 85 20ms 17 May 2022 932nd Mikey-Beep 🇬🇧 698 85 19ms 15 Jun 2022 932nd P-Quentin 🇫🇷 698 85 77ms 10 Aug 2022 932nd 051 🇸🇬 698 85 20ms 19 Aug 2022 932nd trist224 🇫🇷 698 85 68ms 18 Oct 2022 932nd Ripick 698 85 21ms 1 Feb 2023 932nd fkantelberg 698 85 21ms 7 Aug 2023 932nd minhtrancccp 698 85 67ms 1 Nov 2023 932nd wen1now 698 85 19ms 6 Nov 2023 932nd stertooy 🇧🇪 698 85 21ms 14 Jun 2024 932nd FranklinJiaChen 698 85 191ms 5 Aug 2024 932nd KasperKivimaeki 🇫🇮 698 85 20ms 2 Jul 2025 932nd Lv0Sys 🇵🇱 698 85 19ms 5 Dec 2025 947th MeWhenI 🇻🇦 698 109 2ms 27 Dec 2022 948th Natanaelel 🇸🇪 697 33 69ms 22 Jul 2022 948th SirBogman 🇺🇸 697 33 70ms 10 Sep 2022 950th MeWhenI 🇻🇦 697 101 2,785ms 24 Oct 2024 951st janbehrens 🇩🇪 697 109 389ms 21 Nov 2021 952nd raphaelimahorn 696 85 13ms 2 Oct 2021 952nd piano-miles 696 85 13ms 12 Mar 2023 952nd Mazn3k 696 85 14ms 15 Mar 2023 952nd coreynash 696 85 13ms 17 Oct 2023 956th cmayer777 695 136 65ms 7 Jan 2023 956th snoozingnewt 🇨🇦 695 136 461ms 6 Oct 2025 958th klixel 🇨🇦 695 143 152ms 11 May 2023 959th dokutan 694 87 737ms 14 days ago 960th CaedenHarper 🇨🇦 694 99 2ms 5 Nov 2025 First Prev 881–960 of 2,088 Next Last